Drill-chuck.



mowssom. DRlLL CHUCK.

APPLICATION FILED SEPT- 7, I917.

1 21;; M m Patented me. 11, 191?.

AJovzssom.

invczni or STATES flt lllllllhl ll tlhllt lQUE.

ALFRED JONSEiON, F LIDKClJPIING, S'WEHEN.

DRILL-CHUGK. 3.- i

Application filed September 7, tart. terial no. realise.

To all whom it may concern lle it known that l, ALFRED Jonsson, asubject of the King of Sweden, and resident of llorra l lyrkogatan,Lidkoping, in the ltingdom of Sweden, have invented certain new anduseful Improvements in Drilltfhucks, or which the following is aspecification. a "the present invention refers to drill chucks of thekind where a number of rotary tumblers are in gear with an exteriorshell acted upon by a spring and which, when the shell is rotatedagainst the action of the spring, are turned in such a manner that theiredges, which hold the drill, are removed from each other, so that drills0t ditlerent size and cross section can be inserted between the same.When the shell is then released, itis turned back under the action ofthe spring, so that the tumblers are applied against the drill andsecurely hold the same.

The characteristic feature ot the present invention consists in thisthat the teeth extend over the whole or nearly whole length of thetumblers and gear with corresponding teeth on the inside of the shell,and that the tumblers are rotary and detachably located on pivots thatare firmly secured within the body of the chuck. By this combinationseveral important advantages are attained.

l-lereby it will first and foremost be possible to change the chuck fromright working to left working, so that one and the same chuck can beused for right cutting as well as for left cutting drills. For thischanging of the chuck it is only required to take out and turn over thetumblers as well as the spring acting upon the shell.

Another advantage is that the pressure from the drill is wholly taken upby the said pivots and is, thus, prevented from being transmitted to theshell.

it practical form of construction is illustrated on the accompanyingdrawing. Figure it shows the chuck in side elevation and partially insection. Fig. 2 is an end view with the cover removed. Fig. 3 shows asimilar view with the tumblers in another position. lFigs. t and 5 showa tumbler in side view and end view respectively.

The tumblers 1, which are rotary and detachably mounted on pivots 2firmly secured within the chuck, are provided with teeth 3 attendingover the whole length of Specification of Letters Patent. Pate t d ciousin any position they may Dec. 11, 1917.

the same and gear with corresponding teeth l 011 the inside of the shell5. A spring 6 operates to normally hold the tumblers inoperativeposition in which they securely hold the drill (position shownin Fig. 2). On the lower side there is a cover 7 provided with acentralhole 9 for the drill. The cover issecured by means of screws 8whichare screwed into holes provided in the pivots2.

By rotatingthe shell, which is roughened on its outer side, in thedirectionlot the arrow (Fig. 3) the tumblers are turned so as tolieremoved from each other, whereby the drill is released. By this means itwill be possible to remove a drill during the working of the machine andinsert another.

Due to the fact that the teeth 3 extend over the whole or nearly thewhole length of the tumblers andgear with corresponding teeth 4: 011 theinside of the shell, and due to the tumblers being located on the fixedpivots 2,, the application of the tumblers against the drill will bejust as eflicaoccupy and a. sliding oi the drill can, thus, not takeplace, and nor is the shell exposed to any pressure which can renderdillicult the rotation of the same.

Moreover, the considerable advantage is attained, as has been indicatedabove, that the chuck. can be employed for both right and left cuttingdrills. lit it be assumed that the drill is on the drawing adjusted forright cutting drills (i. c. drills cutting when rotating clockwise) andit it is desired to change the chuck and have it adapted for leftcutting drills, one has only to remove the cover 7 by unscrewing thescrews 8 and draw off the tumblers from the pivots 52 secured in thebottom 10, turn them over and pass them on to the pivots again, so thatthe end having previously been turned downward will come upward.Moreover, the spring 6, whose ends are bent and maintained in notchesprovided in the shell and in the bottom. respectively, is also turnedover.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A drill. chuck comprising a main rotary member, a plurality of pivotpins fixed thereon, a spring-actuated shell surrounding said main rotarymember, a tumbler rotatably mounted on. each of said pins and having asector of teeth on one side thereof, teeth on the inside ofsaidspringaetuated shell engaging With the teeth on the tumblers, aneccentric gripping surface on each of said tumblers arranged at the samelevel as, theteeth thereon with respect to a plane at right angles tothe pivot pins, and a removable cap member for holding said tumblers inposition.

2. A drill chuck comprising a main rotary member, a plurality of pivotpins fixed thereon, a spring-actuated shell surrounding said mainro'tarymember a tumbler rotatably mountedon-eac'h of said pins and having asector of teeth extending throughout the 'Whole lengthv of the tumbler,teeth on the inside of said spring-actuated 'shel-l engaging With theteeth on the tumblers, an eccentric gripping surface on, each of saidtumblers also extending throughout the Whole length of the *tu mbl'er,and a removable cap member for holding said tumblers in position. v d

3. A drill chuck comprising a main rotary member, a plurality ofpi'votpins'fixed thereon, a shell" surrounding said main rotary member, as'prin'g'tendi'n'g to rotate said shell around said member andreversible so as to actuate said shell in either direction, a tumblerrotatably mounted on each of said Copies crea er-enemas be obtained forfive cents each, by addressing the on each of said tumblers arranged atthe same level as the teeth thereon with respect to a plane at rightangles to the pivot pins, and a removable cap member for holding saidtumblers in position.

a. A drill chuck comprising a main rotary member, a plurality of pivotpins fixed thereon, a shell surrounding said main rotary member, aspring tending to rotate said shell around said member and reversible soas to actuate said shell in either direction, atumbler rotatably mountedon each of said pins and having a sector of teeth extending throughoutthe whole length of the tumbler, teeth on the inside of said shellengaging with the teeth on the tumblers, an eccentric, serrated,gripping surface on each of said tumblers also extending throughout theWhole length of the tun'ibler, a removable cap member for holding saidtumblers in position, and screws for attaching said cap member to thepivot pins.

In Witness whereof I have hereunto set my hand.

ALFRED JONSSON.

Commissioner of Patents,

Washington, D. C.

